Original business model in e-learning
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Duolingo, free service helps you learn languages with your friends while simultaneously contributing to translate real-world content from the Web.
The company consists of a team of computer scientists, designers, and language specialists creating tools to empower language learners-all for free. Really, there are language learning websites claiming to be free, when in fact they are only free to be used for a limited time. Duolingo’s language learning tools are completely free, because while you are learning you are also creating valuable translations for the world.